Loop opener and spreader for sewing-machines.



PATENTED APR. 23, 1907. o. PEDERSEN. LOOP OPENER AND SPREADER FOR SEWING MACHINES.

APPLIOATION FILED MAY 24, 1908.

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LOOP OPENER AND SPREADER FOR SEWING MAGHINBS.

APPLICATION FILED In 24.1906.

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l5 I I \nvznbov: I .Chvishian Pedemsen UNITED STATES PATENT OFFICE.

CHRISTIAN PEDERSEN, OF ST. LOUIS,- MISSOURI, ASSIGN OR TO LANDIS MACHINE COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

LOOP OPENER AND SPREADER FOR SEWING-MACHINES- Specification of Letters Patent.

Patented April 23, 1907.

Application filed May 24, 1906. Serial No. 318,494.

To all whom, it may concern:

Be it known that I, CHRISTIAN PEDERSEN, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Loop Openers and Spreaders for Sewing-Machines, of which the following is a full, clear, and exact description,- such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a plan view of a portion of a sewing-macl'iine provided with a loop opener and spreader constructed in accordance with my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a detail perspective view showing the position of the needle, shuttle, and loop opener and spreader after the needle has drawn the thread through the work to form the loop and before said loop-opener has started to move forwardly; and Fig. 4 is a view similar to Fig. 3, showing the parts in a different positionnamely, after the loop opener and spreader has entered the loop and spread it to permit the shuttle to pass therethrough.

This invention relates to sewing-machines, and particularly to the loop opening and spreading mechanisms of suchmachines.

The object of my invention is to provide a novel device of simple construction which will open and spread a loop formed by two strands of thread to permit the shuttle of the machine to enter said loop.

Said device consists of a movable member having a pointed end, which passes between the strands of thread forming the loop and spreads said strands apart sufiiciently to enable the shuttle to enter said loop. Preferably said member is pivotally mounted, and its end is substantially wedge-shaped; but it should be understood that said member could be reciprocatingly mounted and be provided with merely a beveled end without departing from the spirit of my invention.

I have herein shown my improved loop opener and. spreader as applied to a machine for sewing leather and provided with a curved needle and an oscillating shuttle. It is obvious. however, that its use is not limited to this particular type of machine, as it could be used equally well With a straight-needle machine provided with either a reciprocating or a rotary shuttle.

Referring to the drawings, which illustrate the preferred form of my invention, 1 designates a curved needle mounted in an oscillating needle-carrier 2, and 3 designates a circularly-moving shuttle that is mounted at one side of the needle-carrier.

My improved loop opener and spreader consistsof a member 4, pivotally connected at 5 to the head 6 of the machine and provided with a substantially wedge-shaped end 7, the point of which is located in alinement with the needle. Said member is curved, as shown in Fig. 2, so that its end 7 will be located below the shuttle 3, the end 7 being wide enough so that a portion thereof eX- tends into the vertical plane in which the shuttle moves. 3

A verticallydisposed rock-shaft 8 is mounted in the head of the machine and is provided at its upper end with an arm 9, that is connected to the member 4 by a link 10, fastened to the upper end of said member. The means for actuating said rock-shaft consists of a cam-groove 11, formed in a camblock 12 and receiving a roller 13 on an arm shaft 8-. The movement of the loop opener and spreader is so timed with relation to the movement of the needle that the needle draws the loop of thread up through the work 15 before said loop opener and spreader commences to move forwardly, as shown in Fig. 3. When the needle reaches the position shown in Fig. 3, the member 4 is actuated to carry its wedgeshaped end 7 between the strands of thread forming the loop, thereby opening the loop and spreading it, as shown in Fig. 4, to permit the shuttle to pass therethrough.

For preventing the inner strand of thread namely, the one which is moved across the path of the shuttle-from slipping ofi the spreading member said member is provided with a shoulder 16, as shown in Figs. 3 and 4. After the shuttle has passed through the loop the member 4 is rocked in the opposite direction to carry its wedgeshaped end out of the path of movement of the needle when it penetrates the work to form the next stitch.

14, fastened to the lower end of the rock-.

Having thus described my invention, what is claimed as new, anddesired to be secured by Letters Patent, is

1. In a sewinganachine, a needle for forming a loop in the thread, a circularly-mo ving shuttle, a pivotallymounted member having a curved portion extending below the shuttle, said member having an inclined surface that extends into the vertical plane in which the shuttle moves, a shoulder at the end of said inclined surface to prevent the thread slipping therefrom, a vertically disposed rock-shaft provided with an arm, a link connecting said arm to the upper end of said pivotally-m ounted member, and a cam for actuating said rock-shaft to cause said member to oscillate in a vertical plane; substantially as described.

2. In a sewing-machine, a curved needle mounted in an oscillating carrier, a circularlymoving shuttle arranged in a vertical plane 3 at one side of said needlecarrier, a vertically 5 disposed member pivotally connected to the head of the machine and adapted to move in the same vertical plane that the needle travels in, said member having a curved portion which extends beneath the shuttle, a substantially wedge-shaped end formed on said member, the point of which is located in alinement with the needle, a shoulder formed on the edge face of said head adjacent the shuttle to prevent the thread from slipping therefrom, and means for moving said member wholly within a vertical plane to cause its'wedge-shaped head to enter the loop and spread it to permit the shuttle to pass therethrough; substantially as described.

In testimony whereof I hereunto afliX my signature, in the presence of two witnesses, this 19th day of May,1906.

CHRISTIAN PEDERSEN. l/Vitnesscs WELLS L. CHURCH, GEORGE BAKEWELL. 

